Database.yml YAML questions

I’m trying to DRY up my database.yml file.

At first I tried settign some variables in my environment.rb to use in
the database.yml, but it doesnt seem that the environment.rb variables
are available to the Erb that gets run on the database.yml (at least not
during rake).

So now I am trying to use an alias to name my databases, but there is
really REALLY bad documentation on aliases/anchors in YAML, at lease if
you google it. And whatever I did figure out doesn’t seem to work.

So I want to replace *app in the following with the folder name for the
rails app. Ie. say I did ‘rails newapp’, I would want my databases to
be named newapp_dev, newapp_test, and newapp_prod. But I dont want to
have to change it in 3 places in the database.yml. I don;t want to
change it all in the database yml, but it seems that the alternative
would be to put a bunch of ENV variables on the commandline (ie. the
ones in environment.rb dont work).

Here is my database.yml:

login: &login
adapter: mysql
username: interact
password: mediaugen
host: localhost

development:
<<: *login
database: *app_dev

test:
<<: *login
database: *app_test

production:
<<: *login
database: *app_prod

So I want to have ‘*app’ replaced with ‘newapp’.

I’ve tried

  • &app “fanatics”
    &app “fanatics”
    app: - &app “fanatics”
    app: &app “fanatics”

to set my alias, but none of these seem to work.

What am I doing wrong? Is the an intelligable reference for yaml that
shows how to use anchors this way?

Slain W. wrote:

I’ve tried

  • &app “fanatics”
    &app “fanatics”
    app: - &app “fanatics”
    app: &app “fanatics”

That should be:

  • &app “newapp”
    &app “newapp”
    app: - &app “newapp”
    app: &app “newapp”

as well as

  • &app newapp
    -&app newapp
    &app newapp
    app: - &app newapp
    app: &app newapp

On Nov 3, 2006, at 10:30 PM, Slain W. wrote:

So I want to replace *app in the following with the folder name for
the
rails app. Ie. say I did ‘rails newapp’, I would want my
databases to
be named newapp_dev, newapp_test, and newapp_prod. But I dont want to
have to change it in 3 places in the database.yml. I don;t want to
change it all in the database yml, but it seems that the alternative
would be to put a bunch of ENV variables on the commandline (ie. the
ones in environment.rb dont work).

What am I doing wrong? Is the an intelligable reference for yaml that
shows how to use anchors this way?

I’m no YAML expert but I think when you use “database: *app_prod” it
will be looking for %app_prod to be defined somewhere, and isn’t
going to pick up on &app.

You can however use erb in your YAML like so:

production:
<<: &login
database: <%= puts ‘#{app_name}_prod’%>


Craig B.

AIM: kreiggers

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